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Ameresco Entered into a $249M (196.5 million GBP) Contract and Long-Term Service (O&M) Agreement with Atlantic Green for One of the UK’s Largest Battery Energy Storage Projects

The 300-megawatt EPC project, powered by Envision Energy's Battery Energy Storage System, is scheduled to break ground in H1 2024

Ameresco, Inc., (NYSE: AMRC), a leading cleantech integrator specializing in energy efficiency and renewable energy, today announced that Ameresco and Envision Energy have been chosen by Atlantic Green to build the Cellarhead project, a 300-megawatt (MW) battery energy storage project (BESS) with a maximum energy capacity of 624 megawatt hours (MWh). The Cellarhead BESS project will be connected to National Grid’s Cellarhead sub-station and will provide the UK with additional energy security and reliability.

Construction is anticipated to commence on site this year with connection to the electricity grid anticipated at the end of 2026. With a maximum energy capacity of 624 megawatt hours, the Cellarhead BESS project will support the UK’s ambition to achieve net zero, supporting the increased penetration of clean energy generation, decrease reliance on fossil fueled generation, and ultimately mitigate greenhouse gas (GHG) emissions.

Atlantic Green was established in 2021, as a joint venture between two entrepreneurial shareholders Nofar Energy, and Interland Group, as a UK-based platform to invest, develop, and operate grid-scale standalone battery energy storage systems across the UK. With a mission to develop a c.2 GW capacity of battery energy storage to fuel the UK’s clean energy transition, the Cellarhead BESS represents a key milestone for both Atlantic Green’s development journey and wider sustainability objectives. As part of the BESS project Ameresco entered into an EPC and O&M contract including battery supply, balance of plant, warranty, and availability guarantees. The EPC full wrap price is c. $249 million (196.5 million GBP). Tier 1 OEM Envision Energy will provide the BESS and associated services, as well as the equipment warranties.

Ameresco and Atlantic Green expect to finish the BESS and secure grid connection by the middle of 2026. Following completion, Atlantic Green will own and operate the BESS as an energy storage asset.

“We believe that a continuous development of battery energy storage is a vital step in the UK’s journey to achieving net-zero carbon emissions, and we are excited to team up with Ameresco to bring this vision to life,” said Nick Bradford, Managing Director of Atlantic Green. “Since our founding, Atlantic Green has consistently prioritized finding strategic ways to leverage our battery storage assets with the wider community and we are eager to answer the rising demand for battery storage with this new project with such a level of energy capacity, to really make the impact on the UK electricity system that is much needed.”

“We’re excited to announce our collaboration with Atlantic Green to construct one of the largest battery energy storage projects in the United Kingdom,” said Mark Apsey, MBE, Senior Vice President of UK Operations at Ameresco. “Energy storage is one of the key technologies required to achieve the UK’s net zero targets. Atlantic Green’s strong company leadership and robust track record of developing similar projects makes them an excellent partner in this endeavor. Together, Ameresco and Atlantic Green will help support the UK’s progress towards increased power autonomy and achieving net-zero carbon emissions by 2050.”

"This project exemplifies our commitment to pushing the boundaries of battery storage technology, a cornerstone of sustainable energy systems,” said Kane Xu, Global VP, Envision Energy. “Partnering with Atlantic Green and Ameresco allows us to demonstrate the pivotal role that advanced battery solutions play in enhancing energy security and enabling a seamless transition to renewable energy sources. We are proud to contribute our cutting-edge technology to this landmark UK initiative."

To learn more about Atlantic Green, visit,

To learn more about Ameresco and the company’s clean energy solutions, visit

To learn more about Envision Energy and their technology solutions for green energy, visit

About Ameresco, Inc.

Founded in 2000, Ameresco, Inc. (NYSE:AMRC) is a leading cleantech integrator and renewable energy asset developer, owner and operator. Our comprehensive portfolio includes solutions that help customers reduce costs, decarbonize to net zero, and build energy resiliency while leveraging smart, connected technologies. From implementing energy efficiency and infrastructure upgrades to developing, constructing, and operating distributed energy resources – we are a trusted sustainability partner. Ameresco has successfully completed energy saving, environmentally responsible projects with Federal, state and local governments, utilities, healthcare and educational institutions, housing authorities, and commercial and industrial customers. With its corporate headquarters in Framingham, MA, Ameresco has more than 1,500 employees providing local expertise in North America and Europe. For more information, visit

About Envision Energy

Envision Energy is a world-leading green technology company that provides renewable energy solutions for global enterprises, governments, and institutions. Encompassing three major business sectors - Smart Wind Turbines, Energy Storage, and Green Hydrogen Solutions, Envision Energy collaboratively constructs comprehensive solutions for energy transformation. It also manages the Envision-Hongshan Carbon-Neutral Fund and owns Envision Racing Formula E team, which conquered the Formula E Teams' Championship in 2023.

Envision Energy has been lauded for its sustainability performance, earning the EcoVadis Gold Medal and a place on the CDP “A-List”. It has been recognized in Fortune's “Change the World” list and ranked among the top 10 smartest companies by the MIT Technology Review.

Today, Envision Energy leverages its global network of R&D and engineering centers across China, the United States, the UK, France, Germany, Denmark, and other countries to continuously lead global green technology development. Envision Energy joined the Science Based Targets initiative (SBTi) and committed to achieving the "Business Ambition for 1.5°C" in 2021. It achieved carbon neutrality across its global operations by 2022 and will achieve carbon neutrality throughout its value chain by 2028.

For more information, visit

About Atlantic Green

Atlantic Green is a joint venture between two entrepreneurial shareholders, Interland and Nofar Energy. Atlantic Green focuses on investing, developing and operating grid-scale standalone battery energy storage projects in the United Kingdom.

​Nofar Energy (TASE: NOFR) is a global Independent Power Producer and developer of renewable energy assets, specialising in solar and battery energy storage. Nofar benefits from global expertise and leadership in the storage sector. Nofar Energy has a portfolio of c. 3.0 GW of solar and energy storage assets across Israel, Spain, Italy, UK, US, Romania, Germany, Poland, Greece and Serbia, of which 1.1 GW are operational or ready to be connected.

​Interland is a private investment group based in London, UK. The group invests in, develops and operates real estate and renewable energy assets in the United Kingdom, Netherlands and Belgium. For more information, visit

The announcement of a customer’s entry into a project contract is not necessarily indicative of the timing or amount of revenue from such contract, of Ameresco’s overall revenue for any particular period or of trends in Ameresco’s overall total project backlog. A portion of this project was included in our previously reported awarded backlog as of March 31, 2024.


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